Add the ability to hide the reference text in the CK Editor content editing

Problem/Motivation

Sometimes reference texts can be very long and it make be desirable only to show the citation number (or text) without the full reference text.

Steps to reproduce

Use the CK Editor enabled field

Proposed resolution

Add a checkbox option to the text format configuration

Remaining tasks

Do the work

User interface changes

Ability to show only citation number (or text) without full reference text

API changes

N/A

Data model changes

N/A